Heating system for kilns



Nov. 17 1925.

HEATING SYSTEM FOR KILNS Filed March 12. 1925 EQQJ QK.

WITNESS:

INVENTOR I Patented Nov. 17, 1.925.

UNITED STATES 1,562,135 PATENT. OFFICE.

JAMES B. AGNEW AND ABIR-AM A. OEFFNER, OF MOUNT UN'ION, PENNSYLVANIA.

' HEATING SYSTEM FOR KILNS.

Application filed March 12, 1925. Serial No. 15,144.

To all whom it may concern:

Be it known that we, JAMES B. AGNEW and QABIRAM A. OnrrNEn, citizens of the United States, residing at Mount Union, in the county of Huntingdon and State of Pennsylvania, have invented new and useful Tm-1 provements in Heating Systems for Kilns, of which the following is a specification.

An object of this invention is a means for introducing hot or cold air or oxygen under pressure into a down draft kiln to mix with the gases from the firebox of the kiln for creating a continuous circulation of the heat units, throughout the entire interior of the kiln and thereby maintaining better combustion as well as a more constant and even distribution of the heat in every part of the kiln.

To the attainment of the foregoing and other objects, which will appear as the nature of the invention is better understood, reference is to be had to the drawings which accompanying and form part of this application. 7

In the drawings Figure 1 is a top plan view of a kiln embodying our improvement.

Figure 2 is a sectional view approximately on the line 2-2 of Figure 1.

Before proceeding with the detail description of our invention we desire it understood that the improvement is applicable to all types of down draft kilns for burning of all ware, such as pottery, fire brick, building brick, paving brick, hollow tile, silica brick and any ware that would be burnt in a kiln or a type of construction similar to a down draft kiln. Further we desire to state that our invention is not adaptable on an up-draft kiln as air or oxygen introduced in this class of kiln by our means would serve only to create a better draft and force the heat units through the stack or chimney and would not circulate the heat units at a constant temperature around the interior of the kiln, which is our primary object. Also a greater consumption and waste of fuel would result.

Referring now to the drawings in detail a down draft kiln of the ordinary construction is broadly indicated by the numeral 1, the fire boxes by the numerals 2 and the grates in the fire boxes by the numerals 3. The kiln 1 is round in plan, and has an arched roof or top. The air conduct-ors employed by us may be constructed. of any desired material, although in the showing of the drawings the same are conventionally disclosed as pipe members. The main conductor 4 is arched over the top,.at the center of the kiln and has a branch 5 which is connected directly to amotor driven fan 6. Air or oxygen is admitted into the fan casing either in heated or normal condition. The conductor 4 has a central branch pipe 4 which enters the center of the top of thekiln and in addition-to admitting air or oxygen into this part of the kiln serves as a supporting brace for the said conductor 4. The conductor l, adjacent to its ends, and inward of the pipe member 5, communicates with a circular conductor 7 that surrounds the side of the kiln adjacent to the top thereof, the said conductor or pipe member 7 being provided with laterally extending inwardly directed branches 8 that enter ports in the kiln. These ports are disposed a distance above the fire boxes 2. Other circular air conductors 9 and 10 are also connected to the main conductor 4:, and these conductors 9 and 10 are provided with downwardly inwardly inclined short branch outlet pipes 11 and 12, respectively, and communicate with ports in the top or roof of the kiln.

The circular conductors are disposed in superimposed relation and are arranged one within the other so that air or oxygen forced therethrough will enter the upper part of the kiln at various angles. This air or oxygen mixes with the ignited gases from the fire boxes and is consumed thereby. The air or oxygen, being under pressure, causes all of the gases or heat units to whirl around the entire interior of the kiln, adds to the combustibility of the gases and creates a constant and more uniform heat in the kiln than is accomplished by forced drafts through the fire boxes or any other devices of which we have knowledge.

l/Ve are aware of devices for directing air through the fire boxes of kilns to increase;

the draft, andalsoof devices for introducing hot air into kilns for the purpose of preheating the'ware before burning. Our sys tem materially differs from these constructions as we do not force air through the fire boxes nor do we introduce the air into the tain temperature,

Having described the invention, We claim I 1. The combination With a down draft kiln, of a means for introducing air under pressure at varying angles through the top and sides of the kiln above the fire boxes thereof, for the purpose set forth.

2. The combination With a down draft kiln, of a means for introducing oxygen under pressure and at varying angles throughout the top of the kiln above the fire' box, comprising a main conductor disposed over the top of a kiln, superimposed annular conductors connected With the main conductor, and all of said conductors having short pipe members Which enter the kiln, for the purpose set forth.

3. The combination With a down draft kiln, of a means for introducing oxygen under pressure into the top portion of the kiln above the fire box to cause the said oxygen to mix with the gases from the fire box and to impart a whirling action to the heat units around the entire interior surface of the kiln, said means including a main conductor arched over and centrally communicating With the top of the kiln, superimposed spaced circular conductors connected to the main conductor and arranged over the top and the upper side of the kiln, and short pipe members on said circular conductors entering the kiln at varying angles.

In testimony whereof We allix our signatures.

JAMES B. AGNEl/V. ABIRAM A. OEFFNER. 

